I'd like some recommendations for Windows software that can monitor and log file usage and bandwidth per website hosted in IIS.
The server is dedicated and has multiple sites hosted on it, all individually listed in IIS.
DU Meter (http://www.hageltech.com/dumeter/about) logs total computer bandwidth usage, can create HTML reports automatically, works when computer is left unattended (nobody logged in).
However, if you need reports separated by IIS site, then you need some other tool. DU Meter works only if you need total server bandwidth usage logged.